[Pkg-pascal-devel] Bug#813452: Bug#813452: Bug#813452: fpc-3.0 regression in armhf and armel architectures

Mon Feb 22 06:16:40 UTC 2016

Dear All,
On Mon, 2016-02-22 at 00:32 +0100, Abou Al Montacir wrote:
> Hi Paul,
> 
> On Wed, 2016-02-17 at 22:26 +0100, Paul Gevers wrote:
> > Hmm, I was a tiny little bit wrong earlier.
> > 
> > I modified hedgewars a tiny bit (patch attached) and build in on
> > debomatic¹. You can see that the failing line reads:
> > "Lua test file specified: /<<PKGBUILDDIR>>/tests/lua/hellfire_burns.lua"
> ...
> > Anyways, it now fails for an access violation. I don't like this at all,
> > but it is hard to say if this is a fpc error or hedgewars'.
> I've tried some simpler code and it looks like the compilation options used by
> hedgewars cause the issue. I don't know if this is normal or not but at least
> we know now that it is not an issue in the code itself but rather in the
> compilation flags.
> 
> I'm copying FPC core in case some one can help with the impact of the used
> compilation flags.
> 
> Here are my experimentation:
> I first created very small programs:
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ cat test1.pas 
> program test;
> begin
>     WriteLn('Hello');
> end.
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ cat test2.pas 
> program test;
> begin
>     WriteLn(stdout, 'Hello');
> end.
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ 
> 
> I first compile using no special flags and both programs execute well:
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ fpc test1
> Free Pascal Compiler version 3.0.0+dfsg-2 [2016/01/28] for arm
> Copyright (c) 1993-2015 by Florian Klaempfl and others
> Target OS: Linux for ARMEL
> Compiling test1.pas
> Assembling test
> Linking test1
> /usr/bin/ld.bfd: warning: link.res contains output sections; did you forget
> -T?
> 4 lines compiled, 0.3 sec
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ ./test1
> Hello
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ fpc test2
> Free Pascal Compiler version 3.0.0+dfsg-2 [2016/01/28] for arm
> Copyright (c) 1993-2015 by Florian Klaempfl and others
> Target OS: Linux for ARMEL
> Compiling test2.pas
> Assembling test
> Linking test2
> /usr/bin/ld.bfd: warning: link.res contains output sections; did you forget
> -T?
> 4 lines compiled, 0.3 sec
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ ./test2
> Hello
> 
> Now, we use a subset of compilation flags from hedgewars and we can just
> reproduce the issue on second program but not the first one:
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ fpc -FU/home/abou/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars/CMakeFiles/hwengine.dir -k-rpath
> -k'\$ORIGIN/../lib/:\$ORIGIN/:/usr/lib/hedgewars/lib/' -FD/usr/bin -Cs2000000
> -fPIC -Fl/home/abou/hedgewars-0.9.22-dfsg/obj-arm-linux-gnueabi/bin -k-
> L/usr/lib/arm-linux-gnueabi -Fl/usr/lib/arm-linux-gnueabi -Fl/usr/lib/arm-
> linux-gnueabi -XLAlua=lua5.1 -Fl/usr/lib/arm-linux-gnueabi/libphysfs.so -O2 -g
> -gl -gp   -dUSE_VIDEO_RECORDING -dPNG_SCREENSHOTS -dSDL_MIXER_NEWER
> -dSDL_IMAGE_NEWER -dDEBUGFILE  test1    
> Free Pascal Compiler version 3.0.0+dfsg-2 [2016/01/28] for arm
> Copyright (c) 1993-2015 by Florian Klaempfl and others
> Target OS: Linux for ARMEL
> Compiling test1.pas
> Assembling test
> Linking test1
> /usr/bin/ld.bfd: warning: link.res contains output sections; did you forget
> -T?
> 4 lines compiled, 0.3 sec
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ ./test1
> Hello
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ fpc -FU/home/abou/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars/CMakeFiles/hwengine.dir -k-rpath
> -k'\$ORIGIN/../lib/:\$ORIGIN/:/usr/lib/hedgewars/lib/' -FD/usr/bin -Cs2000000
> -fPIC -Fl/home/abou/hedgewars-0.9.22-dfsg/obj-arm-linux-gnueabi/bin -k-
> L/usr/lib/arm-linux-gnueabi -Fl/usr/lib/arm-linux-gnueabi -Fl/usr/lib/arm-
> linux-gnueabi -XLAlua=lua5.1 -Fl/usr/lib/arm-linux-gnueabi/libphysfs.so -O2 -g
> -gl -gp   -dUSE_VIDEO_RECORDING -dPNG_SCREENSHOTS -dSDL_MIXER_NEWER
> -dSDL_IMAGE_NEWER -dDEBUGFILE  test2
> Free Pascal Compiler version 3.0.0+dfsg-2 [2016/01/28] for arm
> Copyright (c) 1993-2015 by Florian Klaempfl and others
> Target OS: Linux for ARMEL
> Compiling test2.pas
> Assembling test
> Linking test2
> /usr/bin/ld.bfd: warning: link.res contains output sections; did you forget
> -T?
> 4 lines compiled, 0.3 sec
> (sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-
> gnueabi/hedgewars$ ./test2
> Runtime error 103 at $000101C8
>   $000101C8  $main,  line 3 of test2.pas
> 
> It is not clear for me why RTE 103 is thrown, in the second case but not in
> the first one. I'd expect either both work or neither. Also I don't see what
> is the impact of the compilation flags that are used. Maybe I should perform
> more experimentations in order to find a smaller subset. but that will be
> enough for tonight!I finally managed to find the wrong option! It is -fPIC.
Below are  tests with only -fPIC and with only -O2.
(sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-gnueabi/hedgewars$ fpc -fPIC test2 && ./test2
Free Pascal Compiler version 3.0.0+dfsg-2 [2016/01/28] for arm
Copyright (c) 1993-2015 by Florian Klaempfl and others
Target OS: Linux for ARMEL
Compiling test2.pas
Assembling test
Linking test2
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
4 lines compiled, 0.3 sec
Runtime error 103 at $000101D8
  $000101D8
  $00010124
(sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-gnueabi/hedgewars$ fpc -O2 test2 && ./test2
Free Pascal Compiler version 3.0.0+dfsg-2 [2016/01/28] for arm
Copyright (c) 1993-2015 by Florian Klaempfl and others
Target OS: Linux for ARMEL
Compiling test2.pas
Assembling test
Linking test2
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
4 lines compiled, 0.3 sec
Hello
(sid_armel-dchroot)abou at abel:~/hedgewars-0.9.22-dfsg/obj-arm-linux-gnueabi/hedgewars$ 


 Looks like PIC code was broken in 3.0. Is there anyone aware of that? How can we fix that?
-- 
Cheers,
Abou Al Montacir


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